OK, straight at it!: Testicular swelling can be from a variety of causes: serious and some not so, but should be followed up. Torsion of the scrotum can cause rapid deterioration, a varicocele (vascular swelling usually at your age on left side), if you just had/have/getting mumps as adult: orchitis is a painful swelling. These are just a few things, see an md.
Answered 11/28/2017
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